Just a few weeks ago, the idea that Apple might make a car seemed like an outlandish rumour. Today, it's accepted by many as gospel. Numerous reports have filtered through in recent days, providing more detail on Apple's automotive ambitions.

Of course, nothing has been confirmed yet. The Apple Car would be a massive, multi-year undertaking. But here's what we've heard so far:

It looks like a minivan. The prototype could be subject to change before it hits the roads, however.

Apple has hundreds of people working on Project Titan, including senior figures from the automotive industry. This includes former Ford engineer Steve Zadesky, who helped build the iPhone. There's also Johann Jungwirth, who was Mercedes Benz's R&D chief before being hired by Apple in September 2014.

It might be self-driving. A source told Reuters that "it's a software game. It's all about autonomous driving." The Cupertino company is reportedly "is talking to experts at carmakers and automotive suppliers."

It's been common knowledge for some time — if you move in the right circles. Mac Observer's Bryan Chaffin says that a source tells him "a lot of people at the top in Silicon Valley consider it a given that Apple is working on a car." Chaffin himself is "[close] to 100 percent" certain the rumours are true.

Apple employees say they're working on something that will "give Tesla a run for its money." An Apple employee emailed us last week to say that "Apple's latest project is too exciting to pass up... I think it will change the landscape and give Tesla a run for its money." It's possible they were talking about CarPlay, however — Apple's initiative to have people be able to control car entertainment systems with the iPhone.